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(Nb Model.)

W. O. GUN'GKEL. AIR BRAKE VALVE.

No. 601,252. Patented Mar. 29,1898.

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. I UNITED STATES PATENT OFFICE,

WINFIELD O. GUNGKEL, OFTERRE HAUTE, INDIANA, ASSIGNOR OF ONE- FIFTH TO GEORGE W. FARIS, OF SAME PLACE.

AIR-BRAKE VALVE.

, $PECIFTGATION forming part of Letters Patent No. 601,252, dated March 29, 1898.

Application filed April 29, 1897.

diana, have invented certain new and useful Improvements in Air-Brake Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to valves for airbrakes such as used on railroad-trains; and it consists in the novel construction and combination of the parts hereinafter fully "described and claimed.

The drawing shows a vertical section through a portion of an air-brake cylinder. and its admission-valve.

A is the air-brake cylinder, provided with a piston a, which is connected to the brake in any approved manner.

B is the casing of the admission-valve, secured to the cylindercover A and provided with an air-passage b. l

'O is the automatic supplyvalve. This valve is preferably a piston-valve and is' arranged vertically in the casing B.

The casing is provided with a liner 0, so that its lower portion 6 is of smaller diameter than its upper portion 'e. 2, 3, and 4 are inlet-ports arranged one above the other andconnecting the portion ewith the air-passage I). These ports each consist of one or more small holes drilled through the liner, so that the cup-leathers of the Valve will not be un-.

duly worn. 5 and 6 are exhaust-ports arranged between the passage 12 and the portion e of the casing.

E is the spindle or stem of the piston-valve,

and f is a piston provided with a cup-leather equivalent of the'two pistons if provided with two cup-leathers or packing-rings. tons g and g work in the liner 0. Y

F is an exhaust-passage in the side of the casing, which constantly connects the space The pis- Serial n6. 634,357. (No model.)

f between the pistons f and g with the atmosphere. t

H is the bottom cover of the valve-casing, and h is the compressed-air-supply pipe, connected to the cover H.

I is the top cover of the valve-casing, and i is the relief-pipe, connected to-the upper part e of the casing above the piston f.

The supply-pipe h is connected to a reservoir of compressed air, and the relief-pipe i is connected to the train-pipe. The said reservoir and train-pipe are not shown in the drawing, as they are of any approved construction and arrangement, such as shown in the patent issued to me on May 11, 1897, No.

The upper part of the valve-casing contains a spring or springs which normally presses the valve downward in the casing, as shown in the drawing. Two springs of different strength are preferably used.

J is a strong spring which bears against thetop'cover I and against the bottom of a cup j, which partially incloses the lower part of the spring J. The cup j rests on a thimble' k, which is secured-to the valve-casing. A light spring m bears against the under side of the cup j and against the bottom of a cup m, which rests on the upper end of the valvespindle. The cup m partially incloses the spring m and is slidable in the thimble la.

The pressure of the compressed air is substantially the same in the supply and relief pipes when the brake is not applied. When a portion of the compressed air is let out of therelief-pipe so that the pressure below the valve is sufficient to overcome the pressure of the air and of the light spring m above it,

the valve rises and admits compressed air to the brake-cylinder through the ports 2 and 3. The air thus admitted to the brake-cylinder operates its piston so that the brake is applied lightly. When all the compressed air is let out of the relief-pipe, the pressure of the air below the valve also overcomes 1 the strong spring J. The valve then rises and uncovers all the ports 2, 3, and 4, so that the full pressure of air is applied to the piston in the brake-cylinder. When compressed air is compressed air in the cylinder escapes into the atmosphere through the ports 5 and G and the passage F.

The use of two pistons g and g or their equivalent, a long piston with two packingrings, insures the closure of the exhaust-ports 5 and 6 before the inlet-ports 2, 3, and at are opened.

IVhat I claim is 1. In an air-brake valve, the combination, with a valve-casin g provided with an air-supply connection at one end, a relief-pipe connection at the other end, an exhaust-passage at its middle part, a liner provided with separate inlet and exhaust ports, and a passage behind the liner constantly connecting the said ports with the brake-cylinder; of avalve comprising two pistons of different diameters rigidly connected together and having an airspace bctween them, said valve operating to place the brake-cylinder alternately in communication with the air-supply and with the atmosphere through the said inlet and exhaust ports respectively, substantially as set forth.

2. In an air-brake valve, the combination, with a cylindrical valve-casin g provided with a passage in its side leading to the brakecylinder, and a liner in one end portion of the said casing, said liner having ports communicating with the said passage; of a valve provided with pistons of different diameter slidable in the casing and in the liner, a supply-pipe and a relief-pipe connected to the opposite ends of the casing, and a spring pressing the valve toward the said supplypipe at the outer end of the said liner, substantially as set forth.

3. In an air-brake valve, the combination, with a cylindrical valve-casin g having its upper end portion larger in diameter than its lower end portion, said casing having ports arranged one above the other in the side of its lower portion and leading into the brakecylinder; of a valve provided with a central stem carrying a large piston, which is slidable in the said upper portion, and two smaller pistons, which are slidable in the said lower portion and which operate to close the upper port before uncovering the lower port; a relief-pipe connected to the casing above the valve, an inlet-pipe connected to the casing below the valve, and a spring in the upper part of the casing for pressing the valve toward the said inlet-pipe, substantially as set forth.

4:. In an air-brake valve, the combination, with a cylindrical valve-casing having its upper end portion larger in diameter than its lower end portion, said casing having ports arranged one above the other in the side of its lower portion and leading into the brakeeylinder; of a valve provided with pistons slidable in the said upper and lower portions of the casing, a relief-pipe connected to the casing above the valve, a supply-pipe connected to the casing below the valve, a light spring arranged above the valve, a strong spring also arranged above the valve, and a cup permitting the light spring to be compressed to a prearranged limit and then. operating to compress the strong spring, substantially as set forth.

5. In an air-brake valve, the combination, with a cylindrical valve-casing having its upper end portion larger in diameter than its lower end portion, and a valve provided with pistons slidable in the said upper and lower portions of the casing; of a cover at the top of the casing, a thimble secured to the easing, a cup resting on the said thimble, a strong spring between the said cup and cover, a cup resting on the top of the valve, a lighter spring between the two said cups, a reliefpipe connected to the casing above the valve, and a supply-pipe connected to the easin g below the valve, substantially as set forth.

VINFIELD O. GUNCKEL.

Witnesses HENRY BAKER, A. B. FELSENTHAL. 

